11.10.2 Greatest hits from previous weeks

11.10.2.1 QR Code in shopping cart handle

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=26268

This week, the market people from my work wanted to put QR codes in shopping cart handles, but when they tested it, the QR code did not work. I noted that the cylindrical curvature (even small) ... 
[image-processing]
 

asked by Murta https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=2266 Score of 203

answered by halirutan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=187 Score of 197

11.10.2.2 How to use $\LaTeX$ for typesetting labels and titles in Mathematica

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=15884

I need to typeset large number of equations to be used for  PlotLabel  and  Titles  and such.  These have to look nice. Hence I use <... 
[formatting] [latex]
 

asked by Nasser https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70 Score of 60

answered by Jens https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=245 Score of 47

11.10.2.3 Is it possible to export the equations from Mathematica to MATLAB?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=14035

Is it possible to export the output expressions from Mathematica computations (e.g., equations) in valid MATLAB syntax? 
[export] [matlab]
 

asked by Seyhmus Güngören https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=4256 Score of 47

answered by rm -rf https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5 Score of 51

11.10.2.4 Principal submatrix and Principal minor of a matrix

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=154018

A submatrix of a matrix is obtained by deleting any collection of rows and/or columns. 
 
For example, from the following 3-by-4 matrix, we can construct a 2-by-3 submatrix by removing row 3 and column ... 
[list-manipulation] [matrix] [programming] [linear-algebra]
 

asked by Emad kareem https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=44458 Score of 10

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 Score of 9

11.10.2.5 Finding Limits in several variables

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=21544

Is there a way to find a limit of a multivariable function, like 
 
$$\lim_{(x,y)\to (0,0)} f(x,y)$$ 
with Mathematica? 
 
When $f$ is continuous, we can use 
$$\lim_{(x,y)\to (0,0)} f(x,y)=\lim_{(x,0)\... 
[functions] [calculus-and-analysis]
 

asked by Dominic Michaelis https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5899 Score of 34

answered by whuber https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=91 Score of 44

11.10.2.6 How to tell Mathematica that certain variables are real/imaginary, integer-valued, etc

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=66273

I'm trying to expedite some quantum mechanical calculations (expectation values etc.) by running them through Mathematica. When I say, for example, 
... 
[functions] [complex] [assumptions] [variable-definitions]
 

asked by Matthew Brunetti https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=22304 Score of 56

answered by SquareOne https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=19960 Score of 41

11.10.2.7 How can I plot the direction field for a differential equation?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=8841

I'd like to plot the graph of the direction field for a differential equation, to get a feel for it.  I'm a novice, right now, when it comes to plotting in Mathematica, so I'm hoping that someone can ... 
[plotting] [differential-equations]
 

asked by Matt Groff https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1735 Score of 39

answered by Peter Breitfeld https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=307 Score of 31